Train passengers wait in lines to board buses at the Garrison train station after a rock slide on the railroad tracks between Peekskill and Garrison forced the closure of both north and southbound tracks Saturday, July 19, 2014, in Garrison, N.Y. Tumbling rocks north of New York City have damaged a stretch of train tracks in the nation's second-largest commuter rail system, suspending service and leaving hundreds of passengers without rides. (AP Photo/The Journal News, Frank Becerra Jr.)

GARRISON (AP) >> Tumbling rocks north of New York City have damaged a stretch of train tracks in the nation’s second-largest commuter rail system, suspending service and leaving hundreds of passengers without rides.

The Metro-North Railroad said repairs to the tracks between the Garrison and Peekskill stations on the Hudson Line could take hours but some service should be back by midnight Saturday. It says it’s bringing in shuttle buses.

Some stranded passengers said they’d been waiting for hours.

Rocks rained down on the tracks Saturday afternoon as crews were fixing a retaining wall. No trains were damaged and no one was hurt, but both tracks were left impassible.

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Amtrak service also was affected.

Metro-North said crews are fixing the less-damaged track to restore service before shifting to the second track, which could require more extensive repairs.

The rock slide is the latest headache for a railroad recovering from two major accidents and myriad service disruptions.

In December, a Metro-North Hudson Line train derailed in the Bronx, killing four passengers and injuring more than 70 others.

In May 2013, a train heading east from New York City to New Haven derailed and was hit by a westbound train outside Bridgeport, injuring scores of passengers.

This spring, a retaining wall collapsed near the Glenwood station causing a mudslide that buried a northbound track in mud, soil and other debris. The incident knocked out two of four tracks, leading to speed restrictions and residual delays.